SAN LEANDRO — A sexual relationship between a San Leandro High School teacher and an underage student took place during the latter half of 2013, according to court documents obtained Friday.

San Leandro High School teacher Leon Chang turned himself in Thursday after being charged with engaging in an ongoing sexual relationship with a teenage student, police said.

Chang, 27, was charged Tuesday by the Alameda County District Attorney’s Office with one count of statutory rape and arranging a meeting with a minor for lewd purposes, San Leandro police said in a statement.

According to court documents, the sexual relationship with a female student took place between June and December 2013.

Authorities did not offer any information about how the relationship began or how it came to their attention, saying only that school administrators were notified several months ago, and they notified police.

Officials did not release the student’s age or say whether she had classes with Chang.

In a statement, San Leandro Unified School District Superintendent Mike McLaughlin said the district was “deeply concerned” about the situation and that Chang has been placed on unpaid administrative leave, effective immediately.

McLaughlin said Chang had previously been on paid administrative leave but did not make clear when he was removed from the classroom.

“The district is also investigating this matter and is committed to taking any and all necessary steps to appropriately address the situation,” McLaughlin said in a statement.

School district board member Mike Katz-Lacabe said the news of Chang’s alleged relationship was “surprising” and that it hit close to home, noting that the concern he has for his own daughters is mirrored in his concern for the safety of all students.

“The district is working to figure out what we could have done better to either detect this early or prevent it in the first place,” Katz-Lacabe said. “As parents anßd school board members, our utmost concern first is safety of students. Before any teaching takes place, we need to make sure they are safe.”

Authorities did not release information about Chang’s custody status — whether he was in jail or out on bail — and did not say when he was scheduled to appear in court.

Anyone with information about this case is asked ßto call the San Leandro Police Department at 510-577-3230, the Anonymous Tip Line at 510-577-3278 or the superintendent’s office at 510-895-4199.

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